Overview of the Rear Projection Setup.



Use this setup if you want to create an interactive rear projection onto glass. The Ubi camera is plugged into a PC and the emitter is plugged into a power supply.
Setup steps:

  • Create an 80” display on the glass panel.
  • Mount the Ubi camera behind the glass panel.
  • Mount the emitter on the glass.





Choose Setup


When running Ubi in the “Step by Step Calibration” mode, choose “Rear Projection Setup” and proceed.




Create the physical setup.


Mount the projector, Ubi camera and emitter as specified in the diagram.
Connect all required hardware:

  • The projector must be connected to the PC. It has to be placed behind the glass.
  • The Ubi camera must be connected to the PC. It has to be placed behind the glass
  • The emitter must be plugged into a power source. It will mounted on the front of the glass on the top.

Please refer to this doc for our recommendations on films that are suitable for rear projection on glass.



Mounting the camera


Place the camera behind the glass.
We recommend that the camera is placed behind the rear projection glass (on the same side as the projector). This will allow a better interaction experience as the user won’t have to worry about blocking the camera. If possible, the camera should be placed above discplay level to ensure better detection when interacting. If placed too low, some interaction may not pick up or appear not to work.
If placing the camera behind isn’t viable for your setup, placing it in front will also work. Only recommended if nothing else works.





Mounting the emitter


Place the emitter in front on the glass. The emitter must be placed on the same surface where users will be interacting.
The emitter needs to be placed above the display.
This will ensure that the emitter will not block what is being projected on the glass.



Run Ubi


  • Start Ubi by clicking “Start” or double clicking the desktop shortcut.
  • Proceed through to calibration as directed in the application.


Camera Preview


The camera preview shows you how much of your display the camera can see. Adjust your display until all of your display can be seen by the camera. If you cannot shrink the display, move the position of the camera. For optimal performance, make sure the display fills up as much of the camera preview as possible.

Once you click the Calibrate button, a dot pattern will quickly flash and if the calibration is successful, you will proceed to mount the emitter.

If calibration fails, it is likely due to the following reasons:

1. There is not enough contrast and the camera cannot see all of the display. In this case, adjust the room lighting or brightness of the projector.

2. The entire display is not within view of the camera.

3. There is too much clutter on or around the display that causes Ubi to detect more than 36 calibration dots.



Affix the markers on the display.


Place the two markers provided directly on your display at the location specified (dotted circles).



Power up the emitter.


Connect the emitter to the power supply. After calibration, the emitter is turned on by the Ubi camera and will display a faint blue light. If the emitter does not turn on, please follow these instructions.
When the emitter is off, it will display a red light. Please note that the emitter should be powered down when Ubi is not in use.


Adjust the emitter.


Use the markers and cross hairs to determine when the IR curtain is parallel to the surface. Once the emitter is affixed to the wall, adjust the emitter so that only two crosshairs appear, one on each marker.
Once the emitter is in its final position, you should see a cross hair exactly at your fingertip as you touch around the screen.


Remove the markers.


One the emitter is in its final position, you can remove the markers from your display surface.




Successful Setup.


Once the emitter is in its final position, you have completed the setup process. You will be prompted to choose how you would like to calibrate the next time you use Ubi.


Start Interacting